The macros that are built into the game are strictly limited, each account/server has 18 macros (that'd be the general page) and each character has 18 macros (that'd be the personal page). You can get round this limit with some addons. Personally I use SuperMacro (which may or may not work you'd need to test it) and Trinity Bars v2 (make sure you get version two as version one doesn't do anything for macros).

If you look in the thread entitled Not enough macros! you can see some other options, my personal suggestion is that providing you are just using thats ingle character on that account is to fill up both sets of macros without any addons, as you won't have any issues there and you know they work.